 gchemist
Member #271 Senior Chevytalk Moderator
Posts: 26094
Loc: Austin, TX 78748
Reg: 05-09-00
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08-18-24 09:32 AM - Post#2872825
Walking around at a local car show, I found a '56 Chevy with heater hose bypass valves. I like them. I didn't find the owner to ask the brand name. Has anyone seen them? When the A/C is off, having a bypass will help keep the cab cooler. The continuous fan low speed heats up the cab way too much.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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Edited by gchemist on 08-18-24 09:32 AM. Reason for edit: No reason given.
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bobb
Super Senior Member
Posts: 6760
Loc: paradise
Reg: 09-05-03
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08-18-24 10:52 AM - Post#2872827
In response to gchemist
you only need one. the input to heater core. a simple ball valve will work good.
| 70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails. |
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 26094
Loc: Austin, TX 78748
Reg: 05-09-00
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08-18-24 12:12 PM - Post#2872838
In response to bobb
Hey bobb, I hadn't thought about installing just one. I could try that first. If enough heat is reduced, no need for complete flow cut off.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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1983G20Van
Super Senior Member
Posts: 3994
Loc: Hurst, Texas, USA
Reg: 11-13-02
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08-24-24 10:13 AM - Post#2873012
In response to gchemist
I haved used a simple ball valve in the heater core supply hose for years on numerous vehicles. My 83 G20, 87 G20, 97 Express and 2006 Ram to name a few.
| 1983 G20 Van, 350 TPI, Ported 906 Vortecs, Edelbrock 3817 Base, ASM oversize runners. Reed Custom Roller cam, 700r4, 12 bolt with 3.08 gears, Doug Thorley Tri-Y headers, true duals |
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Liberty Valance
Contributor
Posts: 167
Loc: Euless,Texas
Reg: 07-21-14
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08-27-24 03:25 PM - Post#2873128
In response to 1983G20Van
I heard about this a few years ago. After reading this, I'm thinking about doing it. Is there an actual noticeably difference using a cutoff valve?
1974 Cheyenne 10 LWB STOCK 350 W/HEI /TH350 /AC/ 4 BBL Quadrajet
Mopar by Birth
Chevy by Choice
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 26094
Loc: Austin, TX 78748
Reg: 05-09-00
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08-28-24 01:49 PM - Post#2873178
In response to Liberty Valance
A four port valve is on order. I'll post a picture once I have it installed.
Yes, heat temps will be different. Even with the heater/A/C off, the blow motor still spins. With hot water in the heater, the heat is transferred into the cab. It's very noticeable on mine. The A/C system will work better too.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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Liberty Valance
Contributor
Posts: 167
Loc: Euless,Texas
Reg: 07-21-14
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08-28-24 02:40 PM - Post#2873180
In response to gchemist
I have a 4 speed fan with AC. I have removed the low speed wire from resistor connector so now I have a 3 speed fan with an off position. I did not like the fan running all the time, especially in winter cause when starting, the default setting was air was blowing from AC vents and it was cold.
1974 Cheyenne 10 LWB STOCK 350 W/HEI /TH350 /AC/ 4 BBL Quadrajet
Mopar by Birth
Chevy by Choice
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 26094
Loc: Austin, TX 78748
Reg: 05-09-00
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09-02-24 01:05 PM - Post#2873380
In response to Liberty Valance
Here's the heater core bypass valve. I plan to drain enough coolant to install it. Quick switch over when the heater is needed. The A/C will work better too.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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64ss409
Senior Member
Posts: 1066
Loc: Montana
Reg: 12-04-02
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09-03-24 06:52 AM - Post#2873407
In response to gchemist
I put a single shutoff valve, like in the first photo, in my grain hauling trucks. I shut the valve during harvest so no water flows.
Ron
1964 SS 409/340 4 spd, bought new Oct '63 from Ken Boggs Chevrolet, Geraldine, Montana
1962 SS convertible, 327/250 4 spd
1956 IH pickup, 327
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gchemist
Member #271 Senior Chevytalk Moderator
Posts: 26094
Loc: Austin, TX 78748
Reg: 05-09-00
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09-06-24 04:44 PM - Post#2873548
In response to 64ss409
The bypass valve is installed. I didn't get a chance to turn it on. I'll bleed out the air next week. I pumped out about a gallon of coolant. It was enough not spill any at the heater hoses. It's in the bypass position. A simple turn will allow hot water into the core. It will be nice not to have excess heat in the cab.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE
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